/* ===================================================
   CATB.IN — Home & Category Page Styles v2
   Light-only · Liquid Glass · WCAG AA
   =================================================== */

/* ─── Hero ───────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 96vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
  padding: 128px 24px 80px;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(0,88,179,0.10) 0%, transparent 70%),
    var(--bg-base);
}

.hero-bg { position: absolute; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; }

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.28;
}
.hero-orb-1 {
  width: 560px; height: 560px;
  background: radial-gradient(circle, rgba(0,88,179,0.32) 0%, transparent 70%);
  top: -200px; left: -160px;
  animation: float 9s ease-in-out infinite;
}
.hero-orb-2 {
  width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(76,70,199,0.24) 0%, transparent 70%);
  bottom: -160px; right: -120px;
  animation: float 11s ease-in-out infinite reverse;
}
.hero-orb-3 {
  width: 280px; height: 280px;
  background: radial-gradient(circle, rgba(130,48,176,0.18) 0%, transparent 70%);
  top: 50%; left: 55%;
  transform: translate(-50%,-50%);
  animation: float 14s ease-in-out infinite;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
  margin: 0 auto;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(0,88,179,0.08);
  border: 1px solid rgba(0,88,179,0.18);
  border-radius: var(--r-max);
  padding: 6px 16px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--c-computer);
  margin-bottom: 26px;
  animation: fadeInUp 0.6s var(--ease) 0.1s both;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin-bottom: 22px;
  color: var(--text-900);
  animation: fadeInUp 0.6s var(--ease) 0.2s both;
}

.gradient-text {
  background: linear-gradient(135deg, #0058b3 0%, #4c46c7 55%, #8230b0 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.4vw, 1.2rem);
  color: var(--text-500);
  max-width: 580px;
  margin: 0 auto 34px;
  line-height: 1.7;
  animation: fadeInUp 0.6s var(--ease) 0.3s both;
}

.hero-cta-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s var(--ease) 0.4s both;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  margin-top: 52px;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s var(--ease) 0.5s both;
}

.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
}
.hero-stat .num {
  font-size: 1.9rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-900);
  line-height: 1;
}
.hero-stat .label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-300);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}
.hero-stat-divider { width: 1px; height: 38px; background: var(--glass-border); }

/* ─── Section headings ───────────────────────────── */
.section-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-300);
  text-transform: uppercase;
  letter-spacing: 0.10em;
  margin-bottom: 10px;
}
.section-title {
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
  color: var(--text-900);
}
.section-desc {
  font-size: 1.0625rem;
  color: var(--text-500);
  max-width: 520px;
  line-height: 1.7;
  margin-bottom: 44px;
}

/* ─── Categories Section ─────────────────────────── */
.categories-section {
  padding: 84px 0;
  background: var(--bg-card);
  border-top: 1px solid var(--glass-border);
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

/* Liquid glass category card */
.category-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-xl);
  padding: 1.75rem;
  text-decoration: none;
  display: block;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  box-shadow: var(--shadow-sm);
  transition:
    transform    var(--base) var(--spring),
    box-shadow   var(--base) var(--ease),
    background   var(--fast) var(--ease),
    border-color var(--fast) var(--ease);
}

/* Subtle shimmer overlay on hover */
.category-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255,255,255,0.40) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--base) var(--ease);
  pointer-events: none;
}
.category-card:hover {
  transform: translateY(-6px) scale(1.015);
  box-shadow: var(--shadow-lg);
  background: var(--glass-hover);
  border-color: rgba(0,0,0,0.12);
  text-decoration: none;
}
.category-card:hover::after { opacity: 1; }

/* Per-category accent */
.category-card[data-cat="electrical"]  { --cc: var(--c-electrical); --cc-bg: var(--c-electrical-bg); }
.category-card[data-cat="robotics"]    { --cc: var(--c-robotics);   --cc-bg: var(--c-robotics-bg); }
.category-card[data-cat="computer"]    { --cc: var(--c-computer);   --cc-bg: var(--c-computer-bg); }
.category-card[data-cat="it"]          { --cc: var(--c-it);         --cc-bg: var(--c-it-bg); }
.category-card[data-cat="mechanical"]  { --cc: var(--c-mechanical); --cc-bg: var(--c-mechanical-bg); }
.category-card[data-cat="electronics"] { --cc: var(--c-electronics);--cc-bg: var(--c-electronics-bg); }

.cat-icon-wrap {
  width: 52px; height: 52px;
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 18px;
  background: var(--cc-bg);
  transition: transform var(--base) var(--spring);
}
.category-card:hover .cat-icon-wrap { transform: scale(1.12) rotate(-6deg); }

.cat-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-900);
  margin-bottom: 7px;
  letter-spacing: -0.015em;
}
.cat-desc {
  font-size: 0.875rem;
  color: var(--text-500);
  line-height: 1.65;
  margin-bottom: 18px;
}
.cat-count {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--cc);
  display: flex;
  align-items: center;
  gap: 5px;
}
.cat-arrow {
  margin-left: auto;
  color: var(--cc);
  transition: transform var(--base) var(--spring);
  opacity: 0;
}
.category-card:hover .cat-arrow { transform: translateX(5px); opacity: 1; }

/* ─── Project Cards ──────────────────────────────── */
.featured-section { padding: 80px 0; background: var(--bg-base); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 18px;
  margin-top: 36px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-lg);
  padding: 1.4rem;
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow-xs);
  transition:
    transform    var(--base) var(--spring),
    box-shadow   var(--base) var(--ease),
    border-color var(--fast) var(--ease);
}
.project-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(0,0,0,0.13);
  text-decoration: none;
}

.project-card-cat {
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  display: flex;
  align-items: center;
  gap: 5px;
}
.project-card-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-900);
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.project-card-desc {
  font-size: 0.875rem;
  color: var(--text-500);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  flex: 1;
}
.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid var(--glass-border);
}
.project-card-time {
  font-size: 0.8rem;
  color: var(--text-300);
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ─── Category Page Hero ─────────────────────────── */
.category-hero {
  padding: 96px 0 44px;
  border-bottom: 1px solid var(--glass-border);
  background: var(--bg-card);
}
.category-hero-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 20px;
}
.category-big-icon {
  width: 68px; height: 68px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.1rem;
  flex-shrink: 0;
}
.category-hero h1 { font-size: clamp(1.7rem, 4vw, 2.6rem); margin: 0; }
.category-hero p  { font-size: 1.0625rem; max-width: 580px; margin: 0; }

/* ─── Filter Bar ─────────────────────────────────── */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 0;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--glass-border);
  margin-bottom: 28px;
}
.filter-label { font-size: 0.875rem; font-weight: 600; color: var(--text-300); flex-shrink: 0; }
.filter-pills { display: flex; gap: 7px; flex-wrap: wrap; flex: 1; }
.filter-pill {
  padding: 6px 15px;
  border-radius: var(--r-max);
  font-size: 0.84rem;
  font-weight: 500;
  border: 1px solid var(--glass-border);
  background: var(--bg-card);
  color: var(--text-500);
  cursor: pointer;
  transition: all var(--fast);
  white-space: nowrap;
}
.filter-pill:hover { border-color: var(--accent); color: var(--accent); }
.filter-pill.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.search-input-wrap { position: relative; flex-shrink: 0; }
.search-input-wrap input {
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-md);
  padding: 8px 16px 8px 36px;
  font-size: 0.875rem;
  color: var(--text-900);
  font-family: inherit;
  outline: none;
  width: 210px;
  transition: border-color var(--fast), box-shadow var(--fast);
}
.search-input-wrap input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,102,204,0.12);
}
.search-input-wrap input::placeholder { color: var(--text-300); }
.search-input-wrap .search-icon {
  position: absolute;
  left: 11px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-300);
}

/* ─── Category projects grid ─────────────────────── */
.cat-projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 16px;
}

/* ─── How It Works (Home) ────────────────────────── */
.how-section {
  background: var(--bg-subtle);
  border-top: 1px solid var(--glass-border);
  border-bottom: 1px solid var(--glass-border);
  padding: 80px 0;
}
.steps-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 44px;
}
.how-step { text-align: center; padding: 1.5rem; }
.how-step-num {
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 1.05rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 14px;
  box-shadow: 0 4px 14px rgba(0,102,204,0.30);
}
.how-step h4 { margin-bottom: 7px; }
.how-step p  { font-size: 0.9rem; }

/* ─── Responsive ─────────────────────────────────────────────
   Category pages — mobile first
   Google guidelines: tap targets ≥48px, no horizontal scroll
────────────────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-row        { grid-template-columns: repeat(2, 1fr); }
  .cat-projects-grid{ grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  /* Hero */
  .hero { min-height: auto; padding: 88px 16px 48px; }
  .category-hero { padding: 80px 0 32px; }
  .category-hero-inner { flex-direction: column; gap: 12px; text-align: center; }
  .category-big-icon {
    width: 64px; height: 64px;
    font-size: 2rem;
    margin: 0 auto;
  }

  /* Stats row */
  .hero-stats { gap: 16px; flex-wrap: wrap; justify-content: center; }
  .hero-stat-divider { display: none; }

  /* Grids */
  .categories-grid  { grid-template-columns: repeat(2, 1fr); gap: 14px; }
  .steps-row        { grid-template-columns: 1fr; }
  .cat-projects-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .projects-grid    { grid-template-columns: 1fr 1fr; gap: 12px; }

  /* Filter bar: horizontal scroll, no wrap */
  .filter-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .filter-pills {
    display: flex;
    overflow-x: auto;
    gap: 8px;
    padding-bottom: 2px;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .filter-pills::-webkit-scrollbar { display: none; }
  .filter-pill {
    white-space: nowrap;
    flex-shrink: 0;
    min-height: 40px;
    padding: 8px 16px;
  }
  /* Search full-width */
  #project-search {
    width: 100% !important;
    box-sizing: border-box;
    margin-left: 0 !important;
    min-height: 40px;
    border-radius: 10px !important;
  }
}

@media (max-width: 540px) {
  .categories-grid   { grid-template-columns: 1fr; }
  .cat-projects-grid { grid-template-columns: 1fr; }
  .projects-grid     { grid-template-columns: 1fr; }
  .hero-eyebrow { font-size: 0.78rem; }
  /* Category cards compact */
  .category-card { padding: 18px 16px; }
  .category-count { font-size: 0.75rem; }
  /* Project cards */
  .project-card { padding: 16px 14px; }
  .project-card-title { font-size: 0.95rem; }
}

@media (max-width: 380px) {
  .hero { padding: 80px 12px 40px; }
  .category-hero { padding: 72px 0 24px; }
}